421030021 has 8 divisors (see below), whose sum is σ = 424214784. Its totient is φ = 417857280.

The previous prime is 421030009. The next prime is 421030061. The reversal of 421030021 is 120030124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 421030021 - 2⁵ = 421029989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 421029983 and 421030010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421030061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74661 + ... + 80101.

It is an arithmetic number, because the mean of its divisors is an integer number (53026848).

Almost surely, 2^421030021 is an apocalyptic number.

It is an amenable number.

421030021 is a deficient number, since it is larger than the sum of its proper divisors (3184763).

421030021 is a wasteful number, since it uses less digits than its factorization.

421030021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6011.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 421030021 is about 20519.0160826488. The cubic root of 421030021 is about 749.4989370261.

Adding to 421030021 its reverse (120030124), we get a palindrome (541060145).

The spelling of 421030021 in words is "four hundred twenty-one million, thirty thousand, twenty-one".